Slither (2006)

The sleepy town of Wheelsy could be any small town in America - somewhat quaint and gentle, peopled with friendly folk who mind their own business. But just beneath the surface charm, something unnamed and evil has arrived... and is growing. No one seems to notice as telephone poles become clogged with missing pet flyers, or when one of the town's richest citizens, Grant Grant, begins to act strangely. But when farmers' livestock turn up horribly mutilated and a young woman goes missing, Sheriff Bill Pardy uncovers the dark force laying siege to his town.

Official website: http://www.slithermovie.net/